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49
HOW TO USE
The locations of Sigma, Tau and Chi
Octantis on the position scales change year
by year due to precession of the Earth.
You need to compensate the locations of the 3 stars
on the position scales yearly.
The movement of Sigma Octantis
from 2014 to 2040 by precession
The movement of Tau Octantis
from 2014 to 2040 by precession
The movement of Chi Octantis
from 2014 to 2040 by precession